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All answers having "Prayers" as clue:

4 Character Answers:

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AVES



5 Character Answers:

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HOPES

PLEAS



6 Character Answers:

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MATINS



7 Character Answers:

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NOVENAS

ORISONS



8 Character Answers:

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LITANIES



9 Character Answers:

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AVEMARIAS

DEVOTIONS



10 Character Answers:

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ENTREATIES